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+
+########################
+Dual-Hub DMVPN with VyOS
+########################
+
+DMVPN is a Dynamic Multipoint VPN technology that provides the capability 
+for creating a dynamic-mesh VPN network without having to pre-configure 
+(static) all possible tunnel end-point peers those simplifying deployment 
+and management of the newly added remote sites. There are 3 main protocols 
+primarily used to implement DMVPN:
+
+* NHRP - provides the dynamic tunnel endpoint discovery mechanism (endpoint 
+registration, and endpoint discovery/lookup) 
+* mGRE - provides the tunnel encapsulation itself 
+* IPSec - protocols handle the key exchange, and crypto mechanism
+
+For his example we are using the following devices:
+
+* 2 x Hubs
+* 3 x Spokes
+* 1 x Client device (VPC)
+* 1 x ISP router
+
+The following software was used in the creation of this document:
+
+* Operating system: VyOS
+* Version: 1.3-beta-202112090443
+* Image name: vyos-1.3-beta-202112090443-amd64.iso
+
+
+
+********
+Topology
+********
+.. image:: /_static/images/VyOS_Dual-Hub_DMVPN.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+
+
+******************************************
+Network Addressing and Protocol Parameters
+******************************************
+
+The following ip addressing schema used for the devices IPv4 connectivity:
+
+10.X1.0.0/30 - p2p Hubs to ISP networks, where X is Hub site number
+10.Y1.1.0/24 - p2p Spokes to ISP networks(DHCP), where Y is Spoke site number
+172.16.253.0/29 - tunnels addressing for Hub-1 connections
+172.16.254.0/29 - tunnels addressing for Hub-2 connections
+192.168.0.0/24 - HQ site local network
+192.168.Z.0/24 - remote sites local network, where Z is Spoke site number
+
+eBGP parameters for the routers:
+
+AS65000 - HQ (Hub-1 and Hub-2)
+AS6500X - Spokes, where X is Spoke site number
+
+
+
+*************
+Configuration
+*************
+
+
+
+Step-1: Configuring IGP and enabling MPLS LDP
+=============================================
+
+At the first step we need to configure the IP/MPLS backbone network using OSPF as 
+IGP protocol and LDP as label-switching protocol for the base connectivity between 
+**P** (rovider), **P** (rovider) **E** (dge) and **R** (oute) **R** (eflector) nodes:
+
+- VyOS-P1:
+
+.. code-block:: none
+   
+   # interfaces 
+   set interfaces dummy dum10 address '10.0.0.3/32'
+   set interfaces ethernet eth0 address '172.16.30.1/24'
+   set interfaces ethernet eth1 address '172.16.40.1/24'
+   set interfaces ethernet eth2 address '172.16.90.1/24'
+   set interfaces ethernet eth3 address '172.16.10.1/24'
+   set interfaces ethernet eth5 address '172.16.100.1/24'
+   
+   # protocols ospf+ldp
+   set protocols mpls interface 'eth1'
+   set protocols mpls interface 'eth2'
+   set protocols mpls interface 'eth3'
+   set protocols mpls interface 'eth5'
+   set protocols mpls interface 'eth0'
+   set protocols mpls ldp discovery transport-ipv4-address '10.0.0.3'
+   set protocols mpls ldp interface 'eth0'
+   set protocols mpls ldp interface 'eth1'
+   set protocols mpls ldp interface 'eth2'
+   set protocols mpls ldp interface 'eth3'
+   set protocols mpls ldp interface 'eth5'
+   set protocols mpls ldp router-id '10.0.0.3'
+   set protocols ospf area 0 network '0.0.0.0/0'
+   set protocols ospf parameters abr-type 'cisco'
+   set protocols ospf parameters router-id '10.0.0.3